How Many Calories Do You Burn By Exercising For 90 Min?

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I am 5'2 and I am 15 years old and 175ibs. I am trying to lose 50 pounds and do it slowly, my goal is 1 year - 2 years to lose all of it. If I exercise on that elliptical and do some planks, push-ups, crunches, etc. for 90 minutes most of the week and only take in 1,300 calories each day, do you guys think I will burn 500 calories by doing those steps?

P.S this elliptical is pretty old school and doesn't say a thing about how many calories I burned or mph and all that. I guess you can say its just jogging for 45 minutes.

Calories is a major topic when it comes to weight loss. We need to know 3 definitions: the amount of calories in our food, the amount of calories a certain physical action uses up each hour, and last but not least our own personal daily allowance of calories. I found the responses to all of these issues by checking out the web portal in the box below, they have plenty of tips, I worked off 8 pounds by using their methods.

danosh.weight-lossonline.info

yeahh i guess...
i think that maybe u're burning more than 500...
the elliptical is hard though... i can only do like 5 mins... its harsh
but well...i dont work out... lol

calories in vs. calories out. you need to burn or cut out 3500 calories to loose one lb. so if you cut out 500 calories a day from your normal eating habbits and run enough to burn 150 calories then in a week youll loose a pound bla bla bla just remember you need to loose 3500 calories to loose one lb. but with your cardio, try interval training.